Freewheel Pre-Tensioning Frame to Reduce Spring Attrition
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Solution Overview
Problem
Existing freewheels face challenges with increased attrition between the spring element of the pre-tensioning device and adjacent components during tensioning and relaxing, and difficulty in mounting due to complex insertion of the spring element.
Innovation Solution
A freewheel design featuring a spring support frame that simplifies the handling and mounting of the pre-tensioning device by reducing frictional forces through a modular structure with a spring element supported indirectly or directly on the first race, using a spring support frame that can move relative to the first race, and incorporating protruding attachments and limbs for secure support and reduced attrition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the spring element is directly supported on the first race or side part, then the pre-tensioning force is effectively transmitted, but attrition increases between the spring element and adjacent components during tensioning and relaxing
Solution Approach 1:
A guide element is introduced as an intermediary component between the spring element and the first race/side part. The guide element has a guide surface that guides the spring element during tensioning and relaxing, distributing the contact over a larger area and reducing frictional forces. This mediator prevents direct contact between the spring element and the first race, thereby reducing attrition while maintaining effective pre-tensioning force transmission.
2Device complexity
If the spring element is inserted directly into the clamping gap, then the pre-tensioning device is compact, but the insertion and mounting process becomes difficult and requires increased effort
Solution Approach 1:
The guide element is designed with features that facilitate preliminary positioning and insertion of the spring element before final assembly. The guide surface and geometric configuration of the guide element allow the spring element to be preliminarily guided into the correct position, reducing the effort required for insertion and mounting while maintaining the compact design of the pre-tensioning device.
3Device complexity
If the spring element has direct contact with the first race, then the structural design is simplified, but hysteresis effects increase due to friction during tensioning and relaxing
Solution Approach 1:
The guide element serves as a mediator that reduces frictional contact between the spring element and the first race. By providing a optimized guide surface, the guide element minimizes the contact pressure and sliding friction during the tensioning and relaxing cycles, thereby reducing hysteresis effects and energy loss while maintaining a relatively simple overall structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design facilitates easier assembly, reduces frictional forces during tensioning and relaxing, and enhances the effective spring force applied to the clamping element, minimizing hysteresis effects and preventing attrition and jamming.
Implementation Method 1
the pre-tensioning device has a spring element supported indirectly or directly on the first race
Data Source
AI summary
The present invention relates to a freewheel (2) having a first race (16), a second race (18), a clamping gap (20) formed between the first and second race (16, 18), at least one clamping element (30) in the clamping gap (20) and a pre-tensioning device (32) for pre-tensioning the clamping element (30) in a clamping position inside the clamping gap (20), wherein the pre-tensioning device (32) has a spring element (34) supported indirectly or directly on the first race (16). The pre-tensioning device (32) further has a spring support frame (36) that can be moved in relation to the first race (16), in which spring support frame the spring element (34) is arranged.